scholarly journals Quantitative Histopathology of Stained Tissues using Color Spatial Light Interference Microscopy (cSLIM)

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hassaan Majeed ◽  
Adib Keikhosravi ◽  
Mikhail E. Kandel ◽  
Tan H. Nguyen ◽  
Yuming Liu ◽  
...  
Keyword(s):  
New Technologies ◽  
Imaging Modality ◽  
Interference Microscopy ◽  
Phase Imaging ◽  
Bright Field Image ◽  
Interferometric Imaging ◽  
Breast Cancer Patients ◽  
Prognostic Information ◽  
Light Interference ◽  
Tissue Phase

Abstract Tissue biopsy evaluation in the clinic is in need of quantitative disease markers for diagnosis and, most importantly, prognosis. Among the new technologies, quantitative phase imaging (QPI) has demonstrated promise for histopathology because it reveals intrinsic tissue nanoarchitecture through the refractive index. However, a vast majority of past QPI investigations have relied on imaging unstained tissues, which disrupts the established specimen processing. Here we present color spatial light interference microscopy (cSLIM) as a new whole-slide imaging modality that performs interferometric imaging on stained tissue, with a color detector array. As a result, cSLIM yields in a single scan both the intrinsic tissue phase map and the standard color bright-field image, familiar to the pathologist. Our results on 196 breast cancer patients indicate that cSLIM can provide stain-independent prognostic information from the alignment of collagen fibers in the tumor microenvironment. The effects of staining on the tissue phase maps were corrected by a mathematical normalization. These characteristics are likely to reduce barriers to clinical translation for the new cSLIM technology.

scholarly journals Epi-illumination gradient light interference microscopy for imaging opaque structures

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Mikhail E. Kandel ◽  
Chenfei Hu ◽  
Ghazal Naseri Kouzehgarani ◽  
Eunjung Min ◽  
Kathryn Michele Sullivan ◽  
...  
Keyword(s):  
Multiple Scattering ◽  
Imaging Modality ◽  
Single Cells ◽  
Scattering Problem ◽  
Biological Tissues ◽  
Interference Microscopy ◽  
Model Organisms ◽  
Phase Imaging ◽  
Label Free ◽  
Light Interference

Abstract Multiple scattering and absorption limit the depth at which biological tissues can be imaged with light. In thick unlabeled specimens, multiple scattering randomizes the phase of the field and absorption attenuates light that travels long optical paths. These obstacles limit the performance of transmission imaging. To mitigate these challenges, we developed an epi-illumination gradient light interference microscope (epi-GLIM) as a label-free phase imaging modality applicable to bulk or opaque samples. Epi-GLIM enables studying turbid structures that are hundreds of microns thick and otherwise opaque to transmitted light. We demonstrate this approach with a variety of man-made and biological samples that are incompatible with imaging in a transmission geometry: semiconductors wafers, specimens on opaque and birefringent substrates, cells in microplates, and bulk tissues. We demonstrate that the epi-GLIM data can be used to solve the inverse scattering problem and reconstruct the tomography of single cells and model organisms.

scholarly journals Topography and refractometry of sperm cells using SLIM

2017 ◽  
Author(s):  
Lina Liu ◽  
Mikhail E. Kandel ◽  
Marcello Rubessa ◽  
Sierra Schreiber ◽  
Mathew Wheeler ◽  
...  
Keyword(s):  
Refractive Index ◽  
Interference Microscopy ◽  
Phase Imaging ◽  
Label Free ◽  
Quantitative Phase Imaging ◽  
Ensemble Averaging ◽  
Thickness Profile ◽  
Light Interference ◽  
Phase Sensitive

AbstractCharacterization of spermatozoon viability is a common test in treating infertility. Recently, it has been shown that label-free, phase-sensitive imaging can provide a valuable alternative for this type of assay. Here, we employ spatial light interference microscopy (SLIM) to decouple the thickness and refractive index information of individual cells. This procedure was enabled by quantitative phase imaging cells on media of two different refractive indices and using a numerical tool to remove the curvature from the cell tails. This way, we achieved ensemble averaging of topography and refractometry of 100 cells in each of the two groups. The results show that the thickness profile of the cell tail goes down to 150 nm and the refractive index can reach values of 1.6 close to the head.

scholarly journals Monitoring Reactivation of Latent HIV by Label-Free Gradient Light Interference Microscopy

iScience ◽  
2021 ◽  
pp. 102940
Author(s):  
Neha Goswami ◽  
Yiyang Lu ◽  
Mikhail E. Kandel ◽  
Michael J. Fanous ◽  
Kathrin Bohn-Wippert ◽  
...  
Keyword(s):  
Interference Microscopy ◽  
Label Free ◽  
Light Interference ◽  
Latent Hiv

scholarly journals What matters to patients? A mixed method study of the importance and consideration of oncology patient demands

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Mathias WAELLI ◽  
Etienne Minvielle ◽  
Maria Ximena Acero ◽  
Khouloud Ba ◽  
Benoit Lalloué
Keyword(s):  
Cancer Patients ◽  
Mixed Method ◽  
New Technologies ◽  
Care Pathway ◽  
Scale Up ◽  
Healthcare Delivery ◽  
Delivery Systems ◽  
Breast Cancer Patients ◽  
Structured Interviews ◽  
Oncology Patient

Abstract Background A patient-centred approach is increasingly the mandate for healthcare delivery, especially with the growing emergence of chronic conditions. A relevant but often overlooked obstacle to delivering person-centred care is the identification and consideration of all demands based on individual experience, not only disease-based requirements. Mindful of this approach, there is a need to explore how patient demands are expressed and considered in healthcare delivery systems. This study aims to: (i) understand how different types of demands expressed by patients are taken into account in the current delivery systems operated by Health Care Organisations (HCOs); (ii) explore the often overlooked content of specific non-clinical demands (i.e. demands related to interactions between disease treatments and everyday life). Method We adopted a mixed method in two cancer centres, representing exemplary cases of organisational transformation: (i) circulation of a questionnaire to assess the importance that breast cancer patients attach to every clinical (C) and non-clinical (NC) demand identified in an exploratory inquiry, and the extent to which each demand has been taken into account based on individual experiences; (ii) a qualitative analysis based on semi-structured interviews exploring the content of specific NC demands. Results Further to the way in which the questionnaires were answered (573 answers/680 questionnaires printed) and the semi-structured interviews (36) with cancer patients, results show that NC demands are deemed by patients to be almost as important as C demands (C = 6.53/7 VS. NC = 6.13), but are perceived to be considered to a lesser extent in terms of pathway management (NC = 4.02 VS C = 5.65), with a significant variation depending on the type of non-clinical demands expressed. Five types of NC demands can be identified: demands relating to daily life, alternative medicine, structure of the treatment pathway, administrative and logistic assistance and demands relating to new technologies. Conclusions This study shows that HCOs should be able to consider non-clinical demands in addition to those referring to clinical needs. These demands require revision of the healthcare professionals’ mandate and transition from a supply-orientated system towards a demand-driven approach throughout the care pathway. Other sectors have developed hospitality management, mass customisation and personalisation to scale up approaches that could serve as inspiring examples.

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